Lenticulina cultrata (de Montfort)

Hanagata, S & Nobuhara, T, 2015, Illustrated guide to Pliocene foraminifera from Miyakojima, Ryukyu Island Arc, with comments on biostratigraph, Palaeontologia Electronica (Cambridge, England) 33 (8), pp. 1-142 : 29-30

Lenticulina cultrata (de Montfort)

Figures 11.1, 11.2

1798 Nautilus calcar Linné varietas λ (lambda) Fichtel and Moll, p. 78, pl. 13, figs. e—g.

1808 Robulus cultratus de Montfort , p. 215, figure on p. 214.

1941 Robulus aff. lucida Cushman — LeRoy (Part 1), p. 24, pl. 3, figs. 64, 65.

1951 Robulus lucidus (Cushman) — Asano (Part 15), p. 5, text-figs. 21, 22 (non Cristellaria lucida Cushman, 1923 ).

1956 Robulus lucidus (Cushman) — Asano (a), pp. 48, 49, pl. 1, figs. 15—18, pl. 2, figs. 5, 6. 10.

1984 Lenticulina cultrata (Montfort) — Rögl and Hansen, pp. 57, 58, pl. 16, figs. 2, 4, text-fig. 21.

2001 Lenticulina cultrata (Montfort) — Kawagata, pp. 74, 75, fig. 5.8.

Diagnosis. Moderate–sized species with four to five chambers in final whorl, chambers broad and inflated, sutures moderately curved and depressed, peripheral keel narrow and thin.

Remarks. This species resembles Cristellaria lucida Cushman in general shape, as identified by

Asano (1951, part 15). Due to homonymy ( Barker,

1960), the name is now Lenticulina atlantica

(Barker). Lenticulina cultrata is distinguished from

L. atlantica by fewer chambers per whorl that are more inflated and broader.

Occurrence. Rare in the Onogoshi and Yonahama formations, common in the Minebari Formation.

Figures

FIGURE 11. Family Vaginulinidae. All scale bars = 0.1mm, unless otherwise indicated. 1, 2. Lenticulina cultrata (de Montfort), 1: MPC-26352 from sample 2 (Minebari Formation, PL5); 2: MPC-26353 from sample MK02A-2 (Minebari F., PL5). 3, 4. Lenticulina depressa (Asano), 3: MPC-26354 from sample 11 (Onogoshi F.,?PL1); last three chambers show aberrant inflation; 4: MPC-26355 from sample 18 (Oura F.,?PL1) broken specimen. 5, 6. Lenticulina inornata (d'Orbigny), 5: MPC-26356 from sample 3-2-up-sand (Onogoshi F., PL1); 6: MPC-26357 from sample MK02B (Minebari F., PL5). 7. Lenticulina iota (Cushman), MPC-26358 from sample 3-2-up-sand (Onogoshi F., PL1). 8, 9. Lenticulina orbicularis (d'Orbigny), 8: MPC-26359 from sample 6 (Yonahama F., PL2); 9: MPC-26360 from sample MK01 (Yonahama F., PL2). 10, 11. Lenticulina sintikuensis Nakamura, 10: MPC-26361, 11: MPC-26362, both from sample 6-2 (Yonahama F., PL2). 12. Lenticulina thalmanni (Hessland), MPC-26363 from sample 2-2 (Minebari F., PL5). 13, 14. Lenticulina vortex (Fichtel and Moll), 13: MPC-26364 from sample 2-2 (Minebari F., PL5); 14: MPC-26365 from sample MK02A-2 (Minebari F., PL5); 13, broken specimen. 15. Marginulinopsis striatulus (Cushman), MPC-26369 from sample 4 (Minebari F., PL5). 16, 17. Neolenticulina variabilis (Reuss), 16: MPC-26389 from sample 1-2 (Minebari F., PL5); 17: MPC-26390 from sample 18 (Oura F.,?PL1).